EP0416832A3 - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

Info

Publication number
EP0416832A3
EP0416832A3 EP19900309596 EP90309596A EP0416832A3 EP 0416832 A3 EP0416832 A3 EP 0416832A3 EP 19900309596 EP19900309596 EP 19900309596 EP 90309596 A EP90309596 A EP 90309596A EP 0416832 A3 EP0416832 A3 EP 0416832A3
Authority
EP
European Patent Office
Prior art keywords
image forming
forming apparatus
image
forming
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19900309596
Other versions
EP0416832A2 (en
EP0416832B1 (en
Inventor
Yukio C/O Canon Kabushiki Kaisha Isaka
Yoji C/O Canon Kabushiki Kaisha Serizawa
Akio C/O Canon Kabushiki Kaisha Noguchi
Yukihide C/O Canon Kabushiki Kaisha Ushio
Seiji C/O Canon Kabushiki Kaisha Uchiyama
Kazuro C/O Canon Kabushiki Kaisha Yamada
Makoto C/O Canon Kabushiki Kaisha Takeuchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP23366189A external-priority patent/JPH0396382A/en
Priority claimed from JP23631289A external-priority patent/JPH0398382A/en
Priority claimed from JP1277257A external-priority patent/JPH03140263A/en
Priority claimed from JP2017882A external-priority patent/JPH03223775A/en
Application filed by Canon Inc filed Critical Canon Inc
Publication of EP0416832A2 publication Critical patent/EP0416832A2/en
Publication of EP0416832A3 publication Critical patent/EP0416832A3/en
Application granted granted Critical
Publication of EP0416832B1 publication Critical patent/EP0416832B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/0402—Scanning different formats; Scanning with different densities of dots per unit length, e.g. different numbers of dots per inch (dpi); Conversion of scanning standards
    • H04N1/0405—Different formats, e.g. A3 and A4
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
    • G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
    • G06K15/12—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by photographic printing, e.g. by laser printers
    • G06K15/1204—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by photographic printing, e.g. by laser printers involving the fast moving of an optical beam in the main scanning direction
    • G06K15/1219—Detection, control or error compensation of scanning velocity or position, e.g. synchronisation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
    • G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
    • G06K15/12—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by photographic printing, e.g. by laser printers
    • G06K15/1204—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by photographic printing, e.g. by laser printers involving the fast moving of an optical beam in the main scanning direction
    • G06K15/1223—Resolution control, enlarging or reducing, edge or detail enhancement
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/0402—Scanning different formats; Scanning with different densities of dots per unit length, e.g. different numbers of dots per inch (dpi); Conversion of scanning standards
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/0402—Scanning different formats; Scanning with different densities of dots per unit length, e.g. different numbers of dots per inch (dpi); Conversion of scanning standards
    • H04N1/0408—Different densities of dots per unit length
    • H04N1/0411—Different densities of dots per unit length in the main scanning direction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/0402—Scanning different formats; Scanning with different densities of dots per unit length, e.g. different numbers of dots per inch (dpi); Conversion of scanning standards
    • H04N1/042—Details of the method used
    • H04N1/0443—Varying the scanning velocity or position
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/0402—Scanning different formats; Scanning with different densities of dots per unit length, e.g. different numbers of dots per inch (dpi); Conversion of scanning standards
    • H04N1/042—Details of the method used
    • H04N1/0446—Varying the modulation time or intensity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/113—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using oscillating or rotating mirrors
    • H04N1/1135—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using oscillating or rotating mirrors for the main-scan only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/12—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Fax Reproducing Arrangements (AREA)
  • Laser Beam Printer (AREA)
  • Control Or Security For Electrophotography (AREA)
EP90309596A 1989-09-07 1990-09-03 Image forming apparatus Expired - Lifetime EP0416832B1 (en)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP233661/89 1989-09-07
JP23366189A JPH0396382A (en) 1989-09-07 1989-09-07 Printer
JP236312/89 1989-09-11
JP23631289A JPH0398382A (en) 1989-09-11 1989-09-11 Printer
JP1277257A JPH03140263A (en) 1989-10-26 1989-10-26 Image recorder
JP277257/89 1989-10-26
JP17882/90 1990-01-30
JP2017882A JPH03223775A (en) 1990-01-30 1990-01-30 Image forming device

Publications (3)

Publication Number Publication Date
EP0416832A2 EP0416832A2 (en) 1991-03-13
EP0416832A3 true EP0416832A3 (en) 1992-12-16
EP0416832B1 EP0416832B1 (en) 1996-07-10

Family

ID=27456850

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90309596A Expired - Lifetime EP0416832B1 (en) 1989-09-07 1990-09-03 Image forming apparatus

Country Status (3)

Country Link
US (2) US5475414A (en)
EP (1) EP0416832B1 (en)
DE (1) DE69027723T2 (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69018739T2 (en) * 1989-09-06 1995-09-14 Canon Kk Image recorder.
US6064419A (en) * 1994-12-28 2000-05-16 Canon Kabushiki Kaisha Timings of rotational speed in a laser beam printer
JPH11348343A (en) 1998-06-03 1999-12-21 Canon Inc Method and apparatus for forming image
JP2000203082A (en) * 1999-01-13 2000-07-25 Ricoh Co Ltd Image forming apparatus
JP3821080B2 (en) * 2002-09-30 2006-09-13 ブラザー工業株式会社 Printing device
JP2005001136A (en) * 2003-06-09 2005-01-06 Noritsu Koki Co Ltd Exposure device and exposure method
US8488186B2 (en) * 2007-01-24 2013-07-16 Xerox Corporation Gradual charge pump technique for optimizing phase locked loop (PLL) function in sub-pixel generation for high speed laser printers switching between different speeds
US8693048B2 (en) * 2007-01-24 2014-04-08 Xerox Corporation Sub-pixel generation for high speed color laser printers using a clamping technique for PLL (phase locked loop) circuitry
US8155436B2 (en) * 2008-03-31 2012-04-10 Konica Minolta Laboratory U.S.A., Inc. Systems and methods for color data compression
US8121435B2 (en) * 2008-03-31 2012-02-21 Konica Minolta Laboratory U.S.A., Inc. Systems and methods for resolution switching
US8098942B2 (en) * 2008-06-30 2012-01-17 Konica Minolta Systems Laboratory, Inc. Systems and methods for color data compression
US8068667B2 (en) * 2008-03-31 2011-11-29 Konica Minolta Systems Laboratory, Inc. Systems and methods for color data compression
US20090244601A1 (en) * 2008-03-31 2009-10-01 Konica Minolta Systems Laboratory, Inc. Systems and Methods for Color Data Compression
US20090244633A1 (en) * 2008-03-31 2009-10-01 Konica Minolta Systems Laboratory, Inc. Systems and Methods for Color Data Compression
JP5903406B2 (en) * 2013-06-28 2016-04-13 京セラドキュメントソリューションズ株式会社 Light beam sensor position adjustment method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4393387A (en) * 1979-09-14 1983-07-12 Canon Kabushiki Kaisha Beam recording apparatus effecting the recording by a plurality of beams
DE3618031A1 (en) * 1985-05-31 1987-01-08 Toshiba Kawasaki Kk LIGHT BEAM SCANNER
DE3736334A1 (en) * 1986-10-27 1988-05-05 Minolta Camera Kk PRINTING DEVICE
DE3810894A1 (en) * 1987-03-30 1988-10-13 Minolta Camera Kk LASER PRINTER WITH CHANGE POSSIBILITY FOR THE PIXEL DENSITY
DE3925143A1 (en) * 1988-07-29 1990-02-01 Hitachi Koki Kk ELECTROPHOTOGRAPHIC PRINTER
US4910532A (en) * 1987-05-19 1990-03-20 Minolta Camera Kabushiki Kaisha Image recording apparatus

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3854974A (en) * 1970-08-28 1974-12-17 Xerox Corp Method for transferring a toner image
JPS52105734A (en) * 1976-03-01 1977-09-05 Canon Inc Signal coverter
US4130841A (en) * 1977-03-07 1978-12-19 Xerox Corporation Variable frequency half-tone imaging apparatus
US4952948A (en) * 1984-09-25 1990-08-28 Canon Kabushiki Kaisha Image recording apparatus
US4876562A (en) * 1984-09-25 1989-10-24 Canon Kabushiki Kaisha Image recording apparatus
JPS6242166A (en) * 1985-08-20 1987-02-24 Canon Inc Image recording device
JPS63124786A (en) * 1986-11-14 1988-05-28 Canon Inc Controller for motor
US4847643A (en) * 1987-02-19 1989-07-11 Minolta Camera Kabushiki Kaisha Laser printing system
JPS6446724A (en) * 1987-08-17 1989-02-21 Canon Kk Image recorder
GB8811568D0 (en) * 1988-05-16 1988-06-22 Crosfield Electronics Ltd Producing half-tone images
US5361329A (en) * 1988-08-11 1994-11-01 Canon Kabushiki Kaisha Data processing apparatus
KR910009142B1 (en) * 1988-08-12 1991-10-31 가부시기가이샤 히다찌세이사꾸쇼 Optical scanner
DE68925852T2 (en) * 1988-09-06 1996-10-17 Canon Kk Exposure control unit
US5140349A (en) * 1988-09-27 1992-08-18 Canon Kabushiki Kaisha Recording apparatus
US5012293A (en) * 1989-08-24 1991-04-30 International Business Machines Corporation Transfer station control in an electrophotographic reproduction device
JPH0387773A (en) * 1989-08-31 1991-04-12 Canon Inc Image printer
JPH03110596A (en) * 1989-09-26 1991-05-10 Canon Inc Printer
US5258779A (en) * 1990-02-17 1993-11-02 Canon Kabushiki Kaisha Image forming apparatus with means for controlling feeding of recording medium
US4993772A (en) * 1990-02-20 1991-02-19 Irvin Automotive Products, Inc. Spring-loaded, dual-action hinge assembly for vehicle accessories

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4393387A (en) * 1979-09-14 1983-07-12 Canon Kabushiki Kaisha Beam recording apparatus effecting the recording by a plurality of beams
DE3618031A1 (en) * 1985-05-31 1987-01-08 Toshiba Kawasaki Kk LIGHT BEAM SCANNER
DE3736334A1 (en) * 1986-10-27 1988-05-05 Minolta Camera Kk PRINTING DEVICE
DE3810894A1 (en) * 1987-03-30 1988-10-13 Minolta Camera Kk LASER PRINTER WITH CHANGE POSSIBILITY FOR THE PIXEL DENSITY
US4910532A (en) * 1987-05-19 1990-03-20 Minolta Camera Kabushiki Kaisha Image recording apparatus
DE3925143A1 (en) * 1988-07-29 1990-02-01 Hitachi Koki Kk ELECTROPHOTOGRAPHIC PRINTER

Also Published As

Publication number Publication date
DE69027723D1 (en) 1996-08-14
US5610646A (en) 1997-03-11
EP0416832A2 (en) 1991-03-13
US5475414A (en) 1995-12-12
DE69027723T2 (en) 1997-01-09
EP0416832B1 (en) 1996-07-10

Similar Documents

Publication Publication Date Title
EP0419122A3 (en) Image forming apparatus
EP0421806A3 (en) An image forming apparatus
EP0420427A3 (en) Image forming apparatus
GB9017908D0 (en) Image forming apparatus
EP0410738A3 (en) Image forming apparatus
EP0417014A3 (en) Picture forming apparatus
EP0415753A3 (en) An image forming apparatus
EP0409204A3 (en) Image forming apparatus
GB2232781B (en) Image forming apparatus
EP0386978A3 (en) An image forming apparatus
EP0565213A3 (en) An image forming apparatus
EP0413358A3 (en) Image forming apparatus
EP0415752A3 (en) Image forming apparatus
GB2242804B (en) Image forming apparatus
EP0384467A3 (en) Image forming apparatus
EP0416832A3 (en) Image forming apparatus
EP0410817A3 (en) Image forming apparatus
EP0411579A3 (en) Image forming apparatus
EP0428172A3 (en) An image forming apparatus
EP0416919A3 (en) Image forming apparatus
EP0415722A3 (en) Image forming apparatus
EP0377315A3 (en) Image forming apparatus
EP0415717A3 (en) An image forming apparatus
GB2239216B (en) Image forming apparatus
EP0381518A3 (en) An image forming apparatus

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19901231

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB IT

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB IT

RHK1 Main classification (correction)

Ipc: B41J 2/44

17Q First examination report despatched

Effective date: 19940406

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

ITF It: translation for a ep patent filed

Owner name: SOCIETA' ITALIANA BREVETTI S.P.A.

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REF Corresponds to:

Ref document number: 69027723

Country of ref document: DE

Date of ref document: 19960814

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20030820

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20030919

Year of fee payment: 14

Ref country code: DE

Payment date: 20030919

Year of fee payment: 14

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040903

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050401

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20040903

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050531

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050903